# micro:bit Lesson 1. Using the Built-in Sensors

## Overview

The BBC micro:bit has a number of built-in sensors that make it really easy to get started with a few simple projects. 

In this lesson you will learn how to use the micro:bit's accelerometer to make a simple movement activated alarm. You will also learn how to use the micro:bit's magnetometer chip to detect the presence of a magnet.

![](https://cdn-learn.adafruit.com/assets/assets/000/050/174/medium800/sensors_F01_01b.jpg?1516029530)

If you flip your micro:bit over, you can see both the accelerometer and magnetometer (compass) marked on the bottom left of the photograph above.

- [Next Page](https://learn.adafruit.com/micro-bit-lesson-1-using-the-built-in-sensors/magnetometer.md)

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